4 * Copyright (c) 2012, Derek Buitenhuis
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
24 AVFrame previous_frame;
29 static int zerocodec_decode_frame(AVCodecContext *avctx, void *data,
30 int *data_size, AVPacket *avpkt)
32 ZeroCodecContext *zc = avctx->priv_data;
33 AVFrame *pic = avctx->coded_frame;
34 AVFrame *prev_pic = &zc->previous_frame;
35 z_stream *zstream = &zc->zstream;
36 uint8_t *prev = prev_pic->data[0];
42 if (avpkt->flags & AV_PKT_FLAG_KEY) {
44 pic->pict_type = AV_PICTURE_TYPE_I;
47 av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
48 return AVERROR_INVALIDDATA;
51 pic->pict_type = AV_PICTURE_TYPE_P;
54 if (avctx->get_buffer(avctx, pic) < 0) {
55 av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
56 return AVERROR(ENOMEM);
59 zret = inflateReset(zstream);
61 av_log(avctx, AV_LOG_ERROR, "Could not reset inflate: %d.\n", zret);
62 return AVERROR_INVALIDDATA;
65 zstream->next_in = avpkt->data;
66 zstream->avail_in = avpkt->size;
71 * ZeroCodec has very simple interframe compression. If a value
72 * is the same as the previous frame, set it to 0.
75 for (i = 0; i < avctx->height; i++) {
76 zstream->next_out = dst;
77 zstream->avail_out = avctx->width << 1;
79 zret = inflate(zstream, Z_SYNC_FLUSH);
80 if (zret != Z_OK && zret != Z_STREAM_END) {
81 av_log(avctx, AV_LOG_ERROR,
82 "Inflate failed with return code: %d.\n", zret);
83 return AVERROR_INVALIDDATA;
86 if (!(avpkt->flags & AV_PKT_FLAG_KEY))
87 for (j = 0; j < avctx->width << 1; j++)
88 dst[j] += prev[j] & -!dst[j];
90 prev += prev_pic->linesize[0];
91 dst += pic->linesize[0];
94 /* Release the previous buffer if need be */
95 if (prev_pic->data[0])
96 avctx->release_buffer(avctx, prev_pic);
98 *data_size = sizeof(AVFrame);
99 *(AVFrame *)data = *pic;
101 /* Store the previous frame for use later.
102 * FFSWAP ensures that e.g. pic->data is NULLed. */
103 FFSWAP(AVFrame, *pic, *prev_pic);
108 static av_cold int zerocodec_decode_close(AVCodecContext *avctx)
110 ZeroCodecContext *zc = avctx->priv_data;
111 AVFrame *prev_pic = &zc->previous_frame;
113 inflateEnd(&zc->zstream);
115 /* Release last frame */
116 if (prev_pic->data[0])
117 avctx->release_buffer(avctx, prev_pic);
119 av_freep(&avctx->coded_frame);
124 static av_cold int zerocodec_decode_init(AVCodecContext *avctx)
126 ZeroCodecContext *zc = avctx->priv_data;
127 z_stream *zstream = &zc->zstream;
130 avctx->pix_fmt = PIX_FMT_UYVY422;
131 avctx->bits_per_raw_sample = 8;
133 zc->size = avpicture_get_size(avctx->pix_fmt,
134 avctx->width, avctx->height);
136 zstream->zalloc = Z_NULL;
137 zstream->zfree = Z_NULL;
138 zstream->opaque = Z_NULL;
140 zret = inflateInit(zstream);
142 av_log(avctx, AV_LOG_ERROR, "Could not initialize inflate: %d.\n", zret);
143 return AVERROR(ENOMEM);
146 avctx->coded_frame = avcodec_alloc_frame();
147 if (!avctx->coded_frame) {
148 av_log(avctx, AV_LOG_ERROR, "Could not allocate frame buffer.\n");
149 zerocodec_decode_close(avctx);
150 return AVERROR(ENOMEM);
156 AVCodec ff_zerocodec_decoder = {
157 .type = AVMEDIA_TYPE_VIDEO,
159 .id = CODEC_ID_ZEROCODEC,
160 .priv_data_size = sizeof(ZeroCodecContext),
161 .init = zerocodec_decode_init,
162 .decode = zerocodec_decode_frame,
163 .close = zerocodec_decode_close,
164 .capabilities = CODEC_CAP_DR1,
165 .long_name = NULL_IF_CONFIG_SMALL("ZeroCodec Lossless Video"),